Azo dyestuff containing chromium



Patented Sept. 10, 1929.

UNITED STATES PATENT OFFICE.

' HANS KKMMEBER, OF MANNHEIM, GERMANY, ASSIGNOR TO GENERAL ANILINE WORKS, INC., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

AZO ID YES'IUFF CONTAINING CHROMIUIME.

No Drawing. Application flled J'an.uary 26, 1928, Serial No. 249,771, and in Germany February 9, 1887.

. I have found that a valuable dyestufi on taining chromium maybe obtained when the dyestuif obtainable from diazotized metanilic acid and salicylic acid is treated with agents 5 which contain chromium. The dyestufl so obtained is distinguished from the chromium i dyestuffs of similar composition already known by its clear, green-tinge yellow shade, and also by its excellent fastness. This dyestuff is applicable also for calico printing, very fast yellow shades, with a greenish tinge, being produced. It is also suitable for v the. productlon of batik goods, ure yellow efiects or bright greens on an indigo ground beingproduced.

The following example will further illustrate the nature of the said invention which however is not limited thereto. Theparts are by weight.

Ewamle.

700 'parts of the dyestufi obtainable from diazotized meta'nilic acid and salicylic acid corresponding to the formula:

. QN-NQOH OQH 00B 'my hand.

HANS 'KAlfllERER.. 

